Hinge dowel for transverse joints of concrete roadways and the like



A. E. BRICKMAN 2,207,085

NOV- 23, 3 sheets sheet l Za M4N, ib/776g [naw/fors LfQ/v E BE/CK July9, 1940.

HINGE DOWEL FOR TRANSVERSE JOINTS OF CONCRETE ROADWAYS AND THE LIKE A;E. BRICKM AN July 9, 1940.

HINGE DOwEL Eon TRANsvERsE-JOINTS 0F CONCRETE RoADwAYs AND THE LIKEFiled Nov. 23, 1958 .3 Sheets-Sheet 2 [Ewenfo:

4m/v E, 5

A. E. BRICKMAN July 9, 1940.

HINGE DOWEL FOR TRANSVERSE JOINTS OF CONCRETE BOADWAYS AND rfHElhlllfEFiled Nov- 23, 193s 5 Sheets-Sheet 5 Il l HNHNNWII UAA/v VE. 5E

Patented July 9, 1940 UNITED STATES PATENT OFFICE HINGE DWEL FOBTRANSVERSE JINTS F CONCRETE ROADWAYS AND THE LIKE Alan E. Brickman,

Rostravor Township, West- Application November 23, 1938, Serial No.242,11

6 Claims. (Cl. 94-18) The present invention relates to dowelng devicesfor transverse .joints of concrete highways.

An object of the present invention is the provision of a hinged dowelmember which will permit free movement of the pavement slabs inexpansion, contraction or curling.

A further object of the present invention is the provision of a doweldevice formed from castings and assembled so as to provide a hingedaction at the transverse joint.

Other objects and advantages will become a'p'- parent as the descriptionproceeds and reference is had to the accompanying drawings, in which:

Figure 1 is a sectional plan through a transverse joint, showing thedowel device of the present invention in elevation with a portionthereof in section to show the hinged connecgon between the membersforming the dowelng device;

Figure 2 is a sectional side elevation of the dowel in position at atransverse expansion joint of a concrete highway;

Figure 3 is a view similar to Figure 2, only showing the position of thedowelng device under contraction due to the expansion of the concreteslabs; l

Figure 4 is a view similar to Figure 3, showing the relationship betweenthe elements forming the hinge dowel device where expansion takes placeat the top surface of the concrete slabs in advance of the bottomsurface; and,

- Figure 5 is a detailed elevation showing the method of assembling thehinge dowel device. v

In the drawings, the dowel device of the present invention comprisesgenerally three malleable iron castings designated generally at A, B,and C. These castings, when assembled to produce the hinged dowelngaction, are positioned through a conventional joint filler E andembedded within the concrete slab sections.

'I'he member A forming one part of the dowel assembly may,for the sakeof convenience, be

designated as a hinge housing" comprising a body portion 2 from whichextends, at right angles to the main plane of said body portion, spacedhorizontally positioned arms 3, which are provided with nubs 4 in orderto secure better distribution of stresses and provide means for holdingthis hinge housing A in the concrete bond. This main body portion 2 isprovided with a beveled portion 5 favorable to the flow of wet concreteand eliminates the danger of forming voids. Extending laterally from themain body portion 2 are ears 6.

The member B may, for the purpose of convenience, be designated thefdowel member, and

comprises a diametral portion 1 having outwardly extending bosses 8 withbearing edges Q ex-` tending Vrearwardly from said diametral portion 1and adapted to be slidably positioned within themember C which, forconvenience, has been designated as the dowel socket.

'I'he dowel socket comprises a body portion I0 having rearwardlyextending ribs II, which ribs diverge inwardly toward each other andterminate in nubs I2 in order to hold said dowel socket in the concretebond. vUpon the top surface of said dowel socket, at a point rearward ofsaid main body portion I0, there is provided an upwardly extending nubI3 to assist in maintaining said dowel socket bonded within theconcrete. This dowel socket is so constructed and arranged as to providea central opening within which is slidably positioned the dowel member Bso that the bearing edges 9 of said dowel member B slidably engage theinward projections I4 formed upon the inner surface of said dowelsocket. A tap-hole is provided upon the upper surface of said dowelsocket to receive a set-v screw I5 for holding the doweling device ininitial assembly prior to the pouring of the concrete.

'A ller member I6, of cork or other compressible material, forms aclosure for the open end of the dowel socket C.

A filler block I1 of conventional design is provided with the necessarycut out portions to permit extension of the dowel therethrough.

`In assembling the present dowelng device, the dowel B is insertedthrough the main body portion 2 of the hinge housing a suiiicientdistance to permit the diametral portion 'I to extend on the other sideof vthe main body portion 2 of the hinge housing. A coating of paint orthe like material is applied t0 the surface of said diametral member Iprior to insertion of said member into the main body portion 2 of saidhinge housing in order to form a cleavage action for the assembly andassure free working hinge action after bonding in the concrete. Thediametral portion I having been positioned in the hinge housingythe ears6 are bent down from their dotted line position, as shown in Figure 5,to the full line position so as to securely retain the diametral headportion 'I within the hinge housing. The dowel B is then passed throughthe aperture formed in the compressible joint ller I1 and into the dowelsocket C so that the bearing edges 9 slidably engage the inwardprojections I4 formed on said dowel socket. 'Ihe set-screw is thentightened to bear upon the bearing edge 9 of said dowel so as toinitially maintain the assembly with suiiiclent rigidity to withstandhandling and pouring of the `concrete. 'Ihe setscrew, however, willyield. to the high expansion and contraction forces of the concreteaiter'setting and thereby permit the hinge action of the doweling deviceto function upon expansion and contraction of the concrete slabs.

'Under the present day practice of concrete highway construction,observation tests and physics have disclosed that temperature changes onthe exposed surface of the roadway cause expansion and contraction ofthe top surface of the roadway which may diier greatly from theexpansion and contraction of the bottom or under surface of the roadway.

Due to this variation in the degree of expansion and contraction betweenthe top and bottom surfaces of the roadway, action is set up between theslabs which results in slab curling. While the weight of the concretepavement generally overcomes this curling action, it does so with thedetrimental result of setting up high stresses which are relieved onlyby objectionable cracks. At transverse joints in concrete roadways wherethe slabs and reenforcement end, curling will take place if the dowelingmeans does not have sufficient rigidity to restrain the same. Under thepresent construction, these defects are overcome due to the hingeddoweling means at the transverse joints which permit end curling andrelieve these objectional stresses.

While I have shown and described a specic embodiment of the presentinvention, it will be seen that I do not wish to be limited exactlythereto, since various modications may be made without departing fromthe scope of the invention, as dened by the following claims.

I claim:

1. In a transverse joint ior concrete highways, means permitting freemovement of the pavement slabs during expansion and contraction of thepavement slabs at the joint, said means comprising a housing embedded ina concrete slab, a dowel receiving socket embedded in an adjoiningconcrete slab and a dowel hingedly connected to said housing andslidable within said dowel receiving socket.

2. A doweling device for transverse joints of concrete roadwayscomprising a housing, 'a dowel member and a dowel socket, said dowelmember hingedly connected to Said housing and slidable within said dowelsocket.

3. A doweling device for transverse joints of concrete roadwayscomprising a housing, a dowel member and a dowel socket, said dowelmember hingedly connected to said housing and slidable within said dowelsocket, said dowel socket provided withmeans for holding the dowelingdevice in initial assembly prior to the pouring of the concrete.

4. A doweling device for transverse joints of concrete roadwayscomprising a housing, a dowel member, a dowel socket, said dowel memberhingedly connected to said housing and slidable within said dowelsocket, said dowel socket provided with means for holding the dowelingdevice in initial assembly prior to the pouring of the concrete andmeans on said housing and dowel socket for anchoring said dowelingdevice in the concrete.

5. A transload device for expansion and contraction joints comprising,in combination with a joint ller, a. housing embedded in a concreteslab, a dowel hingedly supported by said housing and extending throughsaid joint filler and a dowel receiving socket member embedded in theadjoining concrete slab for slidably receiving the dowel member.

6. A transload device for expansion and contraction joints comprising,in combination with the joint` filler, a housing embedded in a concreteslab of the roadway, a dowel member hingedly supported in said housingand a dowel socket member embedded in the adjacent concrete slab of theroadway, said dowel extending through the joint ller and into slidablecontact with the dowel receiving socket to provide a hinge and slidablemovement between said transload elements to Simultaneously compensatefor slab end curling and expansion and contraction of the adjoiningconcrete slabs.

ALAN E. BRICKMAN.

